Wireless MIMO Switching with Zero-forcing Relaying and Network-coded Relaying

Details Wireless MIMO Switching with Zero-forcing Relaying and Network-coded Relaying Wireless MIMO Switching with Zero-forcing Relaying and Network-coded Relaying

2011-08-07

arxiv.org/abs/1108.1522v2

Computer Science

Information Theory

A shortened version is submitted to IEEE Journal on Selected Areas in Communications

Scientific paper

A wireless relay with multiple antennas is called a multiple-input-multiple-output (MIMO) switch if it forms a one-to-one mapping from the inputs (uplinks) to the outputs (downlinks). This paper studies the case with $N$ stations and the MIMO switch controls which stations are connected to which other stations. The switching is achieved by "precode-and-forward." In particular, the relay precodes the received vector signal by either a certain matrix. With the zero-forcing precoder, each destination station receives only its desired signal with enhanced noise but no interference. With the network-coded precoder, on the other hand, each station receives not only its desired signal with noise but also self-interference, which can be perfectly canceled. Assuming full channel state information is available at the switch, the design of both precoders for maximizing the minimum received signal-to-noise ratio is investigated. The problem with two stations is solved in closed form in certain cases. In other cases, heuristic algorithms are proposed to optimize the precoder. These algorithms are shown to be near-optimal. A key result is that physical-layer network-coded relaying achieves large gains over zero-forcing relaying.

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